java遍歷讀取xml文件內容

本文實例講解了java遍歷讀取xml文件內容的詳細代碼，分享給大家供大家參考，具體內容如下

package test; import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Iterator; import javax.xml.namespace.NamespaceContext;import javax.xml.namespace.QName;import javax.xml.stream.XMLInputFactory;import javax.xml.stream.XMLOutputFactory;import javax.xml.stream.XMLStreamException;import javax.xml.stream.XMLStreamReader;import javax.xml.stream.XMLStreamWriter; import org.apache.axiom.om.OMAbstractFactory;import org.apache.axiom.om.OMAttribute;import org.apache.axiom.om.OMComment;import org.apache.axiom.om.OMContainer;import org.apache.axiom.om.OMDataSource;import org.apache.axiom.om.OMDocType;import org.apache.axiom.om.OMDocument;import org.apache.axiom.om.OMElement;import org.apache.axiom.om.OMException;import org.apache.axiom.om.OMFactory;import org.apache.axiom.om.OMNamespace;import org.apache.axiom.om.OMProcessingInstruction;import org.apache.axiom.om.OMSourcedElement;import org.apache.axiom.om.OMText;import org.apache.axiom.om.OMXMLParserWrapper;import org.apache.axiom.om.impl.builder.StAXOMBuilder;import org.xml.sax.helpers.XMLReaderFactory; public class Axiomtest { public static void main(String[] args) throws FileNotFoundException, Throwable {// read xml FileInputStream xmlFile = new FileInputStream("line-item2.xml"); XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile); // 還需要StAXOMBuilder對象StAXOMBuilder builder = new StAXOMBuilder(parser); OMElement doc = builder.getDocumentElement(); // 讀到<fool></fool> OMElement cre = doc.getFirstChildWithName(new QName("student")); //讀到<student> OMElement cre1 = cre.getFirstChildWithName(new QName("id")); // 讀到<id></id> System.out.println(cre1.getLocalName()+":"+cre1.getText()); cre1 = cre.getFirstChildWithName(new QName("name")); // 讀到<name></name> System.out.println(cre1.getLocalName()+":"+cre1.getText()); cre1 = cre.getFirstChildWithName(new QName("age")); // 讀到<age></age> System.out.println(cre1.getLocalName()+":"+cre1.getText()); cre1 = cre.getFirstChildWithName(new QName("sex")); // 讀到<sex></sex> System.out.println(cre1.getLocalName()+":"+cre1.getText()); cre1 = cre.getFirstChildWithName(new QName("message")); // 讀到<sex></sex> System.out.println(cre1.getLocalName()+":"+cre1.getText()); System.out.println("------------------------------1"); Iterator<OMElement> iter = doc.getChildElements(); while(iter.hasNext()){ OMElement temp = iter.next(); System.out.println("===================="); System.out.println(temp.getLocalName());// System.out.println(temp.getText()); if(temp.getLocalName().equals("student")){ Iterator<OMElement> iter1 = temp.getChildElements(); System.out.println("----------------"); while(iter1.hasNext()){ OMElement temp1 = iter1.next(); System.out.println(temp1.getLocalName()+":"+temp1.getText()); } } } System.out.println("!!!!!!!!!!!!!"); FileInputStream file = new FileInputStream("line-item2.xml"); XMLStreamReader read = XMLInputFactory.newInstance().createXMLStreamReader(file); StAXOMBuilder sta = new StAXOMBuilder(read); OMElement all = sta.getDocumentElement(); Iterator<OMElement> ite1 = all.getChildElements(); while(ite1.hasNext()){ OMElement temp = ite1.next(); if(temp.getLocalName().equals("student")){ Iterator<OMElement> ite2 = temp.getChildElements(); while(ite2.hasNext()){ OMElement temp1 = ite2.next(); System.out.println(temp1.getLocalName()+":"+temp1.getText()); } } } // write xml OMFactory factory = OMAbstractFactory.getOMFactory(); //建立doc節點,doc節點會和下面的root節點合併OMDocument dod = factory.createOMDocument(); //建立root節點OMElement root = factory.createOMElement("root","",""); OMElement add = factory.createOMElement("dabi","",""); //建立兩個普通節點OMElement stu = factory.createOMElement("student","",""); stu.addChild(factory.createOMText("mac")); OMElement tea = factory.createOMElement("teacher","",""); tea.addChild(factory.createOMText("silly")); //構建樹,將兩個普通節點連到root節點上root.addChild(stu); root.addChild(tea); //構建樹,將root節點連到doc節點上dod.addChild(root); // 構建writer做輸出器XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter( new FileOutputStream("2.xml")); root.serialize(writer); // cache on writer.flush(); FileInputStream xmlFile1 = new FileInputStream("2.xml"); XMLStreamReader parser1 = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile1); StAXOMBuilder builder1 = new StAXOMBuilder(parser1); OMElement doc1 = builder1.getDocumentElement(); Iterator<OMElement> iter1 = doc1.getChildElements(); while(iter1.hasNext()){ OMElement temp = iter1.next(); System.out.println("===================="); System.out.println(temp.getLocalName()+":"+temp.getText()); } System.out.println("!!!!!!!!"); OMFactory omf = OMAbstractFactory.getOMFactory();// OMDocument od = omf.createOMDocument(); OMElement root1 = omf.createOMElement("root","",""); OMElement name = omf.createOMElement("name","",""); OMElement sex = omf.createOMElement("sexy","",""); sex.addChild(omf.createOMText("man")); name.addChild(omf.createOMText("dabi")); root1.addChild(sex); root1.addChild(name);// od.addChild(root1); XMLStreamWriter xmlw = XMLOutputFactory.newInstance().createXMLStreamWriter(new FileOutputStream("3.xml")); root1.serialize(xmlw); xmlw.flush(); }}

 <?xml version="1.0" encoding="UTF-8"?><fool> <student> <name>mac</name> <id>12</id> <age>33</age> <sex>male</sex> <message>hello world</message> </student> <student> <name>silly</name> <id>5</id> <age>12</age> <sex>female</sex> </student> <teacher> <name>Mr. Jones</name> <id>2</id> <age>31</age> <sex>male</sex> </teacher> <student> <name>macy</name> <id>2</id> <age>40</age> <sex>female</sex> </student> <student> <name>tom</name> <id>32</id> <age>31</age> <sex>male</sex> </student> <message>hello world</message></fool>

再分享一例：用JAVA讀取XML文件

解析XML的步驟如下：

• 1.創建DocumentBuilder工廠
  
• 2.創建DocumentBuilder對象
  
• 3.DocumentBuilder對象的parse方法得到Document對象
  
• 4.Document對象的getElementsByTagName得到NodeList集合
  
• 5.通過getFirstChild和getNextSibling進行遍歷
  

用到的包：

• import javax.xml.parsers.*;
  
• import org.w3c.dom.*;
  
• import org.xml.sax.*;

用到的對象：

• DocumentBuilderFactory：創建DocumentBuilder的抽象工廠
• DocumentBuilder：可以從XML 獲取一個Document
• Document：提供供對文檔數據的基本訪問

用到的方法：

• DocumentBuilder.parse(String)'：將給定URI 的內容解析為一個XML 文檔，並且返回一個新的DOM Document對象
• Document.getElementsByTagName(String)'：返回具有給定標記名稱的所有Element 的NodeList
• Element.getAttribute(String)'：通過名稱獲得屬性值

下面來解析一個XML文件

import javax.xml.parsers.*; import org.w3c.dom.*; import org.xml.sax.*; public class Test { public static void main(String[] args) { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); try { DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse("pet2.xml"); NodeList dogList = doc.getElementsByTagName("dog"); System.out.println("共有" + dogList.getLength() + "個dog節點"); for (int i = 0; i < dogList.getLength(); i++) { Node dog = dogList.item(i); Element elem = (Element) dog; System.out.println("id:" + elem.getAttribute("id")); for (Node node = dog.getFirstChild(); node != null; node = node.getNextSibling()) { if (node.getNodeType() == Node.ELEMENT_NODE) { String name = node.getNodeName(); String value = node.getFirstChild().getNodeValue(); System.out.print(name + ":" + value + "/t"); } } System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } }

XML文件

<pets> <dogs> <dog id="1"> <name>YAYA</name> <health>100</health> <love>0</love> <strain>酷酷的雪娜瑞</strain> </dog> <dog id="2"> <name>OUOU</name> <health>90</health> <love>15</love> <strain>聰明的拉布拉多犬</strain> </dog> </dogs> <penguins> <penguin id="3"> <name>QQ</name> <health>100</health> <love>20</love> <sex>Q仔</sex> </penguin> </penguins> </pets>

以上就是本文的全部內容，希望對大家的學習有所幫助。